Deflection yoke comprising magnetically permeable members...

Details Deflection yoke comprising magnetically permeable members... Deflection yoke comprising magnetically permeable members...

H - Electricity

01

J

313/35.125

H01J 29/76 (2006.01)

Patent

CA 1159874

RCA 75,226 Abstract of the Disclosure A self-converging deflection yoke having toroidally-wound vertical deflection coils incorporates a pair of magnetically permeable field formers mounted on either side of the yoke. The field formers shunt a portion of the external field flux to the vicinity of the electron gun assembly where they form a pincushion- shaped field which aids in vertical coma correction. In one embodiment, a yoke comprising planar-wound vertical coils incorporates both coma-correcting rear field formers and a pair of front crossarm assemblies for providing side-pincushion correction. The resultant yoke provides covergence of electron beams free of coma and side- pincushion distortion with reduced sensitivity to transverse motion. In another embodiment, similar results are obtained without the front crossarms by vertical deflection coil having a nonradial winding configuration.

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